After Melkor sowed discord among the Noldor and fled Valinor, Manwë held a feast for the reconciliation of the Eldar. There Fingolfin publicly forgave Fëanor. In the meantime, the Dark Lord found Ungoliant in Avathar and asked her aid against his enemies. Ungoliant helped Melkor infiltrate Valinor by shrouding both herself and her ally in webs of pure darkness. Once within Valinor, Ungoliant drank the light from the Two Trees after Morgoth wounded them with his spear. She also drained dry the Wells of Varda so that nothing remained of the Light of the Two Lamps save that of the Silmarils of Fëanor.[2]

"Then the Unlight of Ungoliant rose up even to the roots of the Trees, and Melkor sprang upon the mound; and with his black spear he smote each Tree to its core, wounded them deep, and their sap poured forth as it were their blood, and was spilled upon the ground. But Ungoliant sucked it up, and going then from Tree to Tree she set her black beak to their wounds, till they were drained; and the poison of Death that was in her went into their tissues and withered them, root, branch and leaf; and they died."